Elevator.



No. 649,262. Patented Ma 8 I900.

0. F. SHEPARD, 1n. y

ELEVATOR.

(No Mbdal.)

er E [Jul-awry NITED STATES PATENT Erica.

OSCAR F. SHEPARD, JR, OF MADEIRA, OHIO, ASSIGNOR TO THE \VARNER ELEVATOR MANUFACTURING COMPANY, OF CINCINNATI, OHIO.

ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 649,262, dated May 8, 1900.

Application filed November 15 1899. Serial No. 737,104. No model.)

To all whom it may concern.-

Be it known that I, OSCAR F. SHEPARD, Jr. a citizen of the United States, and a resident of Madeira, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Elevators, of which the following is a specification.

My invention relates to certain new and useful improvements in elevators.

The object of my invention is to provide a mechanism for automatically stopping the elevator-car at a lower and an upper predetermined limit which at the time it severs connection with the. source of power simultaneously throws the brake to its point of maximum grip upon the shaft which conveys the power to the drum-shaft and leaves the brake at that point, even though the momentum of the parts he not instantaneously checked with the cutting off of the power,and in which the operating device by which the operator controls the car is connected by simple and direct means to the switch for making connection with the source of power. This object is attained by the means described in the annexed specification and illustrated in the accompanying drawings, in which Figure 1 shows my invention as applied to an electric elevator, the motor, controller, brake, and drum being shown in side elevation with the operating-shaft for controlling the switch and the automatic limitation device embodying my invention attached thereto. Fig. 2 is a sectional detail view, upon an enlarged scale, taken through line no a: of Fig. 1 looking toward the right. Fig. 3 is a detail central longitudinal sectional View taken upon line y 3 of Fig. 2. Fig. at is a transverse sectional detail view taken upon line 2 z of Fig. 1, connecting-rod fv being broken in two and the parts being brought together to economize space.

Referring to the parts, the controller A and the motor A are of ordinary construction and need not be specifically described. Drum B, upon which the cables for elevating the car are to be wound in the usual manner, is mounted upon a horizontal shaft Z), which is journaled in the sides of a housing D. Shaft a of the motor is connected by suitable gearing to shaft 1) of the drum. This gearing is hidden by housing D in Fig. 1 and no View is given showing it, as it may consist of any suitable. gearing now in use. Shaft 11 has a worm b keyed to its end, which meshes with a wheel 0, which is secured to a shaft 0, which is journaled in brackets cl d, which project out from the housing D. Shaft O is screwthreaded at the end 0, so that when it is rotated by the worm Z) it is also given a lateral motion to the left or to the right, according as the shaft a rotates.

Upon the end of shaft O are secured two disks 0 0 which have segmental lugs c and c to engage arms a and e, secured upon shaft E, which is journaled in brackets d cl above shaft 0 and carries at one end controllerswitch 6 and at the other end sheave 6 upon which are wound the cables by which the operator in the car controls the travel of the car. The disks 0 and c are secured upon the shaft 0 by collars c and 0 which have beveled or cone-shaped edges to pass through the disks, between the shaft and the disks, and are tightened together by means of nut 0 upon the end of the shaft, so that the positions of lugs c and 0 may be adjusted in relation to shaft 0 by loosening the nut 0 turning the disks, and again tightening the nut.

The proper positions of disks 0 0 upon shaft 0 and of arms 6 and 6 upon shaft E are determined as follows: \Vhen the switch e is thrown up, the car is ascending and the shaft 0 is moving out or, as shown in the drawings, to the left. Arm 6 and disk 0 should be so adjusted and secured upon their shafts that just before the car reaches its upper limit lug 0 contacts with arm 6, throws it down, and carries the switch down to center, as shown in Fig. 1, cutting off current from motor. When switch e is thrown down, the car is descending and the shaft 0 is moving toward the right. Just before the car reaches its lower limit lug 0 contacts with arm a, throwing it up and carrying the switch up to center, again cutting off current.

Upon the shaft E, between bracket (1 and the controller, is secured a lever 6 which is pivoted to a rod f, which is pivoted at its other end to a lever f, which at its other end is pivoted to a standard 9, secured to the bedplate G. To lever f between the points where it is pivoted to the standard g and the rod f, is

secured an arm f which is secured to the brake-strap F, which surrounds the brakepu1leyf which is secured to shaft a between the motor and the housing D.

Lever e is fixed upon the shaft E in a position such that when the controller-switch is thrown to center, cutting 0E current, as shown in Fig. 1, the lever is at the lowest point in its path. In this position brake F is at its pointof maximum grip upon the brake-pulley.

It will be seen now that in operation when the car reaches either itsupper or its lower limit the current is thrown off and the brake is thrown to its point of maximum grip automatically and simultaneously. If the brake should not be of strength sufficient to stop the momentum of the brake-pulley, the rotation of shaft 0 due to the further rotation of shaft a does not affect the grip of the brake upon the brake-pulley, since there is no connection between shafts C and E after the disks 0 or 0 have struck the arms 6 or e.

I have shown and described the best means for embodying my invention known to me; but it is obvious that many more mechanical changes might be made in the means described without departing from the spirit or scope of my invention.

What I claim is 1. In an elevator the combination of a drum and drum-shaft, a main shaft for conveying power to the drum-shaft and a brake-pulley mounted thereon, a brake upon the pulley, a second shaft in gear with the drum-shaft to be simultaneously rotated and moved back and forth by it, lugs upon the second shaft, a shaft carrying a switch for controlling the transmission of power to the main shaft and a sheave by which the operator controls the switch, arms mounted on the controlling-shaft so as to be struck by said lugs to throw the switch to cut off the power automatically at predetermined points, and a lever mounted on the controlling-shaft and coupled to the brake by which the brake is thrown on when the power is cut off, substantially as shown and described.

2. In an elevator the combination of a drumshaft, mechanism for rotating the shaft, a shaft carrying a switch for controlling the transmission of the motive power to said mechanism to rotate the drum-shaft and a sheave by which the operator controls the movement of said switch, a second shaft to be simultaneous'ly rotated and moved back and forth by the drum-shaft and having lugs to contact with arms upon the controllingshaft and automatically throw the switch at predetermined points, and said arms upon the controlling-shaft, substantially as shown and described.

3. In an elevator the combination of a drum and a drum-shaft, a main shaft for conveying power to the drum-shaft and a brake-pulley mounted thereon, a brake upon said pulley, a second shaft geared to the drum-shaft so as to be simultaneously rotated and moved back and forth by it, lugs upon said second shaft, a shaft carrying a switch for controlling the transmission of power to the main shaft and having arms to be struck by said lugs to cut off power at predetermined points,

and a lever secured to said" controlling-shaft and coupled to the brake whereby the brake is thrown on simultaneously with the cutting off of the power, substantially as shown and described.

4. In an elevator the combination of an electric motor whose shaftis geared to a drum, the drum-shaft and itsdrum, a brake-pulley and brake upon the'motor-shaft, a worm upon the drum-shaft, a second shaft journaled adjaoent to the drum-shaft, having a wheel to mesh with the wormand being screw-threaded so that it is simultaneously rotated and moved back and forth by the drum-shaft, disks upon said second shaft having projecting lugs, a shaft journaled adjacent to the second shaft carrying a switch for controlling thetransmission of an electric current to the motor and having two arms one to be struck by one of saidlugs when the second shaft has reached a certain limit in one direction and the other to be struck by the other lug when said shaft has moved to the reverse limit to cut off the current, a lever upon said controlling-shaft coupled to the brake whereby the brake is thrown on simultaneously with the cutting off of the current, substantially as shown and described.

5. In an elevator thecombination of an electric motor, a drum and a drum-shaft journaled in the sides of a housing and actuated by the motor, the housing, a worm upon the drumshaft, a second shaft journaled in brackets upon the housing with a wheel in mesh with the worm and screw-threaded so that the worm imparts a rotary and baek-and-forth motion thereto and carrying two lug-bearing disks, said brackets, a third shaft journaled in said brackets adjacent to the second shaft having two arms one to be engaged by one of said lugs when the second shaft is moving in one direction and the other to be engaged by the other lug when the shaft is moving in the reverse direction, a switch at one end of the third shaft for controlling the transmission of the electric current to the motor and a sheave at the other end of said shaft by which the operator controls the transmission of current to the motor, substantially as shown and described.

6. In an elevator the combination of amotor having a brake-pulley 1n ounted upon its shaft, a brake surrounding the pulley, a drum-shaft journaled in the sides of a housing and actuated by the motor, the housing, a worm upon the drum-shaft, a shaft journaled in brackets upon the housing having a wheel in mesh with the worm and being screw-threaded in the brackets to be moved back and forth as well as rotated by the drum-shaft, lugbearing disks upon said movable shaft, said brackets, a second shaft journaled in the said second shaft coupled to thebrakewhere- IO brackets adjacent to the movable shaft, a by the brake is thrown on simultaneously switch at one end of second shaft to control with the cutting off of the power, substantially the transmission of the electric current to the as shown and described.

motor-shaft, a sheave by which the operator I controls the switch at the other end of second OSCAR SHEPARD shaft, arms upon the second shaft to be en- Witnesses:

gagedby the-lugs at each limit of travel of WALTER F. MURRAY,

the movable shaft, and a lever secured upon EMMA LYFORD. 

